| a widely distributed group of photosynthetic prokaryotic organisms, resembling phototrophic bacteria, occurring in diverse habitats |
| having no sexual organs; independent of sexual processes; not involving the union of male and female germ cells |
rudiment ru·di·ment (r&oomacr;'də-mənt)
n.
An imperfectly or incompletely developed organ or part.
Something in an incipient or undeveloped form. Often used in the plural.